Having joints or articulations; characterized by the presence of joints, particularly referring to organisms with segmented and jointed limbs.
From Greek 'arthron' (joint) + '-ous' (adjective suffix meaning having or full of). The '-ous' ending makes this a direct descriptor meaning 'having joints' or 'jointed.'
All arthropods are 'arthrous'—their name literally means 'jointed foot' from arthron + pous—so if you see 'arthrous' describing an organism, you know it has true segmented joints, which distinguishes it from other animals with merely flexible body parts.
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